low power

So it goes, I lose 10% power from the jackshaft because of gearing.
Im having trouble maintaining my speed. I live in roanoke va, an you'd have a hard time finding a flat spot to ride. plus im using my bike for work.
When im going fast down a hill and come to an uphill, I lose all power and...

My motorized bicycle is an 80cc kit off eBay and I've been having trouble with it ever since I got it and when I thought I finally fixed it now it has a complete loss of power after about 15 seconds meaning it's top speed is like 8 mph and it can't go up any hills to save its life not even...